How to Fertilize Canterbury bells?
Balanced perennial feed every four weeks spring through summer growth

Canterbury bells · Campanula medium
Also known as: Canterbury bell; Coventry bells; Coventry rapes; cup and saucer; fair-in-sight; gingerbread bells; mariettes; Mercury's violets; St Thomas's bell; lady's nightcap
It prefers fertile, moist but well-drained soil. It will tolerate wide range of soil types if well-drained. Grow in sun or partial shade. Suitable for container cultivation
Balanced perennial feed every four weeks spring through summer growth